Non Productive Time - Drilling Operations
#Non Productive Time or NPT/ black hidden time
Drillers consider it #ILT - #Invisible Lost Time
#Drilling Performance and #Optimization #3
#Guide for better drilling performance, analysis and planning.
#Non Productive Time or NPT/ black hidden time
From well total cost the drilling cost is almost 40 % and according to drilling nature and difficulty the cost increase exponentially!
As part of every drilling optimization engineer work is to eliminate NPT, and I am talking here regular black hidden time as:
- Fishing
- Job failure due to tool failure
- Well Control situation
- Loss of Circulation
- Rig Repair
- Waiting on fuel supply or material
- Pipe Sticking
So, reducing NPT means only one thing is to decrease cost and with today’s challenges this is must be considered.
This is one example from local operator I worked with, where well had not completed yet, 15% of total well duration is NPT with total cost of 10 Million $ / total drilling days of 100 days - we are talking here of 1.5 Million $ are lost (This is big money), and with today’s struggle to cut the cost due to oil crisis, this is not luxury, this is a MUST and critical needs. [Check attached image]
- Dig it out and you will be surprised!
- – Image NPT – Image NPT - 2 – Image NPT – 3 - more details
At Rig Site
- #Performance management coaches on the #rig feeding back to a dedicated optimization Engineer onshore.
- Full rationalization and integration of corporate, project knowledge capture and management systems.
- Strong leadership and robust procedures to push feedback to closure overcome old paradigms are really impact performance.
Operations
Flat time not always related to trouble time it could be due non drilling time , which could be improved by working on drilling and service providers crews performance
- [ check image ]
Examples
- Casing and Cementing time
- Tripping in and out of hole
- Logging, wire line, wellhead, working with BOP, .etc.
We can use work breakdown structure to track performance when integrated with well operations or drilling program, by comparing expected time to perform drill floor activities as against the actual, if there is performance gap ( long time), that happen as a result of lack of experience and cohesion required to run a safe and efficient operation; a more experienced eye should be placed on the rig hand, offering them practical advice during drilling operation, that would help prevent injuries and ensure pipe-deck, and drill floor operations are being properly done, reduction in trips and best ROP with excellent hole condition and geometry
#Working on rig and service performance is another subject, have been explained with one of my earlier articles – to read more follow links
- Operations Learn Curve Analysis
https://www.linkedin.com/pulse/drilling-performance-basics-operations-learn-curve-analysis-haggag
- Drilling Operations NPT Mitigation
https://www.linkedin.com/pulse/drilling-operations-npt-mitigation-amr-ibrahim-haggag
- Wellbore Instability
https://www.linkedin.com/pulse/wellbore-stability-amr-ibrahim-haggag
Hope you find this of benefit to you.
